Statistics -ix

In a morning walk, I had 20 rounds of a park. During this period I came across person A, person B, person C and person D, 11 times, 7 times, 10 times and 5 times respectively. I want to represent this data graphically, which of the following is the best representation ?

In a class of 50 students, weights of the students were taken and it was found that for 25 students weights were of different values and other students had weights as those of the 25 values. This data can be represented well as

One day I decided to sit in a shoe shop and observe. I noticed that out of shoes numbers 6, 7, 8 or 9, there were maximum sale for shoe number 8. Which measure of central tendency gives the average

The mean of prime numbers between 20 and 30 is

Mean of 36 observations is 12. One observation 47 was misread as 74, then corrected mean is

Mode of the data 4, 6, 9, 6, 4, 2, 4, 8, 6, 4, 3, 4, 6 is [CCE 2010]